/*
 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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/*
 * $Id: DOMStructure.java,v 1.6 2005/05/09 18:33:26 mullan Exp $
 */
package javax.xml.crypto.dom;

import org.w3c.dom.Node;
import javax.xml.crypto.XMLStructure;
import javax.xml.crypto.dsig.XMLSignature;

/**
 * A DOM-specific {@link XMLStructure}. The purpose of this class is to
 * allow a DOM node to be used to represent extensible content (any elements
 * or mixed content) in XML Signature structures.
 *
 * <p>If a sequence of nodes is needed, the node contained in the
 * <code>DOMStructure</code> is the first node of the sequence and successive
 * nodes can be accessed by invoking {@link Node#getNextSibling}.
 *
 * <p>If the owner document of the <code>DOMStructure</code> is different than
 * the target document of an <code>XMLSignature</code>, the
 * {@link XMLSignature#sign(XMLSignContext)} method imports the node into the
 * target document before generating the signature.
 *
 * @author Sean Mullan
 * @author JSR 105 Expert Group
 * @since 1.6
 */
public class DOMStructure implements XMLStructure {

  private final Node node;

  /**
   * Creates a <code>DOMStructure</code> containing the specified node.
   *
   * @param node the node
   * @throws NullPointerException if <code>node</code> is <code>null</code>
   */
  public DOMStructure(Node node) {
    if (node == null) {
      throw new NullPointerException("node cannot be null");
    }
    this.node = node;
  }

  /**
   * Returns the node contained in this <code>DOMStructure</code>.
   *
   * @return the node
   */
  public Node getNode() {
    return node;
  }

  /**
   * @throws NullPointerException {@inheritDoc}
   */
  public boolean isFeatureSupported(String feature) {
    if (feature == null) {
      throw new NullPointerException();
    } else {
      return false;
    }
  }
}
